EP2076661B1 - Axial fan for conveying cooling air for a cooling device of a motor vehicle - Google Patents
Axial fan for conveying cooling air for a cooling device of a motor vehicle Download PDFInfo
- Publication number
- EP2076661B1 EP2076661B1 EP07818176.5A EP07818176A EP2076661B1 EP 2076661 B1 EP2076661 B1 EP 2076661B1 EP 07818176 A EP07818176 A EP 07818176A EP 2076661 B1 EP2076661 B1 EP 2076661B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- axial
- axial fan
- ring
- shroud
- fan according
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Not-in-force
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
- F01P11/00—Component parts, details, or accessories not provided for in, or of interest apart from, groups F01P1/00 - F01P9/00
- F01P11/12—Filtering, cooling, or silencing cooling-air
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/08—Sealings
- F04D29/16—Sealings between pressure and suction sides
- F04D29/161—Sealings between pressure and suction sides especially adapted for elastic fluid pumps
- F04D29/164—Sealings between pressure and suction sides especially adapted for elastic fluid pumps of an axial flow wheel
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/26—Rotors specially for elastic fluids
- F04D29/32—Rotors specially for elastic fluids for axial flow pumps
- F04D29/325—Rotors specially for elastic fluids for axial flow pumps for axial flow fans
- F04D29/326—Rotors specially for elastic fluids for axial flow pumps for axial flow fans comprising a rotating shroud
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/40—Casings; Connections of working fluid
- F04D29/52—Casings; Connections of working fluid for axial pumps
- F04D29/522—Casings; Connections of working fluid for axial pumps especially adapted for elastic fluid pumps
- F04D29/526—Details of the casing section radially opposing blade tips
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/40—Casings; Connections of working fluid
- F04D29/52—Casings; Connections of working fluid for axial pumps
- F04D29/54—Fluid-guiding means, e.g. diffusers
- F04D29/541—Specially adapted for elastic fluid pumps
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/58—Cooling; Heating; Diminishing heat transfer
- F04D29/582—Cooling; Heating; Diminishing heat transfer specially adapted for elastic fluid pumps
Definitions
- the invention relates to an axial fan according to the preamble of claim 1 and an axial fan with an inlet nozzle according to the preamble of the independent claim 14, known by the DE 33 04 297 C2 the applicant.
- Axial fan for conveying cooling air for cooling devices, in particular cooling modules in motor vehicles are known, for. B. as an axial fan with free-standing blade tips, which rotate in a stationary Zargenring a fan cowl.
- jacket fans in which a jacket is connected to the blade tips of the fan blades and rotates with the fan. Due to the circumferential jacket, blade tip losses, which arise from a flow around the blade tips as a result of the pressure differences on the pressure and suction sides of the fan blades, are avoided.
- the fan is driven by the internal combustion engine of the motor vehicle and is mounted relative to the block of the internal combustion engine.
- the cooling device consisting of heat exchangers, z.
- the applicant has a cooling device with a motor-side driven and supported axial fan is known, which rotates in a motor-fixed Zargenring.
- the fan flow ie the main flow generated by the fan, is superimposed on a bypass flow in the blade tip area.
- the axial depth of the known cooling device is relatively large, in particular because of the fan upstream annular bypass channel for generating the bypass flow.
- the applicant has known a so-called shell fan with an inlet nozzle, wherein the fan and the inlet nozzle fixed to the engine, that are supported on the internal combustion engine of the motor vehicle.
- the jacket is attached to axial vanes of the fan and projects into the inlet nozzle with a forwardly extended cylindrical portion, creating a gap flow with a 180 degree deflection from the pressure side of the fan to the suction side.
- the upstream inlet nozzle also results in a relatively large axial length.
- the effective fan cross-section is reduced by the radially inwardly projecting inlet nozzle, whereby the delivery capacity of the fan is limited.
- the leading edge of the jacket is set back in the direction of flow with respect to the leading edges of the fan blades (also referred to below as fan blades), ie. H. the shroud extends in the axial direction only over a part of the fan blade depth, via the downstream part.
- a fixed guide ring is arranged in this region of the reset of the shell, which preferably has a reduced diameter relative to the shroud.
- the fixed Zargenring is thus arranged in the flow direction in front of the shroud and radially within the shroud.
- the Zargenring may be formed substantially cylindrical or conical with an extension in the flow direction or be provided with a bell-shaped or funnel-shaped inlet region, which is preferably arranged opposite to the L compellingeranströmkanten offset from the flow direction.
- a deflecting element is arranged on the Zargenring in the region of the leading edge of the shroud, which generates a directed against the main flow through the axial fan gap flow.
- the annular deflecting element is extended by an annular surface extending in the direction of flow of the main flow which forms an annular gap with the outer lateral surface of the lateral ring.
- the formation of an effective gap flow is supported, which stabilizes the main flow in the blade tip area, ie within the shell.
- a radially outflow of the outlet flow is favored in a sheath ring which widens in the downstream direction and a ring surface which widens in parallel. This is in an axially limited space - due to a downstream of the fan arranged engine block of the motor vehicle - of particular advantage.
- a radial outflow can be provided on the annular surface Strömungsleitiata, preferably in the form of a radial Nachleitapparates.
- the invention with the aforementioned embodiments thus provides only a partial sheathing of the fan blades with respect to the blade depth due to the resetting of the shell relative to the blade leading edges, wherein in the non-jacketed region, the region of the reset, the fixed Zargenring is arranged.
- the object of the invention is also achieved by an axial fan with the features of the independent claim 13.
- the axial fan according to the invention has a projecting, projecting into an inlet nozzle shroud, whereby the gap flow known from the prior art with a 180-degree deflection for flow stabilization is achieved.
- the axial fan according to the invention has a freestanding front and blade tip edge, ie, a gap in the form of a gusset is left between the upstream blade tip region and the inner surface of the jacket ring.
- the fan blades can thus be better flown in the front and outermost region, ie with lower losses, which result from a Fehlanströmung by the gap or nozzle flow.
- the Fehlanströmung is caused by a relation to the main flow higher speed of the slit or nozzle flow, which also has a peripheral component.
- a disadvantage of the prior art is eliminated by a free, leading blade tip edge. Nevertheless, the stabilizing effect of the nozzle flow is maintained.
- Fig. 1 shows an axial fan 1, which is mounted on a clutch 2, preferably a fluid friction clutch against an internal combustion engine, not shown, of a motor vehicle and driven by this.
- the axial fan 1 is part of a cooling device, which heat exchanger, not shown, for. B. may have a coolant radiator, a charge air cooler and a refrigerant condenser.
- the axial fan 1 is flown in the direction of an arrow L of air, is preferably arranged in the flow direction behind the heat transfer, not shown, and sucks ambient air through the heat exchanger.
- the axial fan 1 is connected via a fan shroud, not shown, for guiding the cooling air with the upstream heat exchangers.
- the axial fan 1 has a hub 3 connected to the clutch 2 and axial blades 4 with a front edge 4 a and a trailing edge 4 b.
- the axis of rotation of the fan is designated by a.
- the axial blades 4 have a blade depth t which extends from the leading edge 4a to the trailing edge 4b.
- the blades 4 have blade tips (blade tips) 4c, to which a shroud 5 with a leading edge 5a and a trailing edge 5b is attached.
- the leading edge 5a is offset from the leading edges 4a of the fan blades 4 by an amount X1 in the flow direction L, while the trailing edge 5b is offset from the trailing edge 4b counter to the flow direction by an amount X2.
- the axial extent I of the shroud 5 is thus smaller than the blade depth t.
- the area of the blade tips 4c, which is in the flow direction in front of the leading edge 5a, ie the area X1 of the resetting of the leading edge 5a has a reduced diameter D1.
- a corner region of the blade tips 4c is recessed, in which a stationary arranged guide ring 6 is arranged, wherein the guide ring 6 has a mean diameter D2, which is greater than the diameter D1, but smaller than the diameter of the leading edge 5a.
- the guide ring 6 is formed substantially cylindrical, overlaps in the axial direction with the axial blades 4 and is slightly opposite to the leading edges 4a, d. H,. opposite to the flow direction L.
- the guide ring 6 is preferably arranged fixed motor, ie, as well as the axial fan 1, ie between the rotating fan 1 and the fixed guide ring 6 occur no relative movements, so that a minimal gap can be realized.
- Fig. 2 shows a fan 7, the a modification of the fan 1 according to Fig. 1 represents, wherein the same reference numerals are used for the same parts as before.
- the fan 7 substantially corresponds to the fan 1, thus has a similar Axialbeschaufelung 4 and a similar shroud 5 on.
- a stationary guide ring 8 is arranged, which is conical or diffuser-like in design, ie widens in the flow direction L.
- the recessed blade tip region 4 c is adapted to the conical shape of the guide ring 8. Due to the diffuser-shaped guide ring 8, the substantially semiaxially oriented main flow of the fan 7 is taken into account, so that the flow is already given a radial component.
- FIG. 3 shows a further embodiment of the invention, in which an axial fan 9 has a jacket 10 with a protruding, cylindrical portion 10a, which projects into a U-shaped or C-shaped inlet nozzle 11 in cross-section.
- a jacket fan with inlet nozzle is known from the aforementioned prior art and generates a gap or nozzle flow, which is superimposed in the blade tip region of the main flow and ensures stabilization of the main flow.
- the leading edges 4a of the fan blades 4 do not extend to the inner surface of the shell 10, whereby a gap s in the form of a gusset is formed.
- the fan blade 4 has, in the upstream region, a free blade tip edge 12 which delimits the gusset s and can be flowed freely by the nozzle flow formed by the inlet nozzle 11. Due to the free blade tip edge 12 and the radially inwardly retracted blade leading edge 4a a Fehlanströmung is avoided by the affected with a peripheral component gap flow.
- Fig. 4 shows a further embodiment of the invention for a fan 13, which substantially the fans 1 and 7 of the embodiments according to Fig. 1 and Fig. 2 equivalent.
- the guide ring 14 which widens conically or bell-shaped counter to the flow direction L and thus forms an inlet funnel for the incoming air.
- the withdrawn blade tip region 4c is adapted to this shape of the guide ring 14 accordingly.
- Fig. 5 shows a further modification of the previous embodiment, ie for a fan 13, the shroud 5, a fixed guide ring 15 is connected upstream, which has at its air inlet region a radially inwardly extending aperture ring 15a.
- the aperture ring 15a covers the radial gap between the guide ring 15 and the blade tip portion 4c of the axial blades 4.
- Fig. 6 shows a further embodiment of the invention with an axial fan 16, which axial blades 4 and a shroud 5 has.
- a guide ring 17, slightly conical and diffuser-like design, is connected upstream of the jacket ring 5 and has a leading edge 17a and an outflow edge 17b.
- a radial gap 18 is left, to which an annular deflecting element 19 attached to the guide ring 17 is assigned.
- FIG. 7 shows a further embodiment of the invention, which is a development of the embodiment according to Fig. 6 represents.
- An axial fan 20 has a Axialbeschaufelung 4 with a shroud 5 and an upstream guide ring 21, on which in addition to the annular deflecting element 19 in the axial and radial direction, parallel to the shroud 5 extending annular surface 22 connects.
- the main flow of the fan 20 is represented by three flow arrows P1, P2, P3, while a gap or nozzle flow is indicated by a fourth arrow P4.
- annular gap 23 Between the outer surface of the jacket ring 5 and the annular surface 22 is an annular gap 23 through which air flows from the pressure side of the fan counter to the main flow direction, is deflected in the deflecting element 19 and through the radial gap 18 in the fan 20, ie the Axialbeschaufelung 4 occurs.
- This gap or nozzle flow indicated by the arrow P4, has a stabilizing effect on the main flow in the fan.
- the geometry of the guide ring 21 and the shroud 5 is such that a diffuser effect results, whereby the main flow P1, P2, P3 is deflected in a radial direction. This is at the cramped space in the motor vehicle in the axial direction, in particular by the downstream arranged, not shown engine block of great advantage.
- Fig. 8 shows a development of the embodiment according to Fig. 7 , wherein the annular surface 22 is further extended in the axial and radial directions and carries flow guide elements 24, which cause a radial orientation of the fan outflow.
- the flow guide elements 24 may be formed in the manner of a radial Nachleitapparates, as described in the earlier application of the Applicant with the official file number xy ... (Sign of the Applicant: 06-B-060).
- Fig. 9 shows a representation of the fan flow for an axial fan according to the prior art.
- the main flow is directed semi-axially, as indicated by parallel arrows P.
- In the upstream blade tip region forms a vortex W, which disturbs the main flow and deteriorates the efficiency of the fan.
- Fig. 10 shows a known from the prior art shell fan with so-called inlet nozzle, through which a nozzle flow, represented by the two outermost arrows D, is generated.
- a nozzle flow represented by the two outermost arrows D.
- the vortex W is eliminated by the nozzle flow D.
- a stable flow is achieved even in the blade tip area.
- Fig. 11 shows a further flow pattern for the axial fan 1 according to the invention according to the embodiment according to Fig. 1 ,
- the flow through the Axialbeschaufelung 4 runs according to the arrows in the half-axial direction.
- a nozzle flow is formed, which is indicated by the outermost arrow F.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Description
Die Erfindung betrifft einen Axiallüfter nach dem Oberbegriff des Patentanspruches 1 sowie einen Axiallüfter mit einer Einlaufdüse nach dem Oberbegriff des nebengeordneten Patentanspruches 14, bekannt durch die
Axiallüfter zur Förderung von Kühlluft für Kühlvorrichtungen, insbesondere Kühlmodule in Kraftfahrzeugen, sind bekannt, z. B. als Axiallüfter mit frei stehenden Blattspitzen, welche in einem feststehenden Zargenring einer Lüfterzarge umlaufen. Bekannt sind auch so genannte Mantellüfter, bei welchen ein Mantel mit den Blattspitzen der Lüfterblätter verbunden ist und mit dem Lüfter umläuft. Durch den umlaufenden Mantel werden Blattspitzenverluste, welche aus einer Umströmung der Blattspitzen infolge der Druckunterschiede auf der Druck- und Saugseite der Lüfterblätter entstehen, vermieden. Bei größeren Kraftfahrzeugen, insbesondere bei Nutzfahrzeugen wird der Lüfter von der Brennkraftmaschine des Kraftfahrzeuges angetrieben und ist gegenüber dem Block der Brennkraftmaschine gelagert. Die Kühlvorrichtung dagegen, bestehend aus Wärmeübertragern, z. B. Kühlmittel- oder Ladeluftkühlern, ist fahrzeugseitig abgestützt, während der Motor elastisch gegenüber dem Fahrzeugrahmen gelagert ist. Daraus ergeben sich Relativbewegungen zwischen dem Lüfter und der Kühlvorrichtung bzw. einer an der Kühlvorrichtung befestigten Lüfterzarge. Die Relativbewegung zwischen den motorfesten Teilen wie z. B. der Lüfter und den fahrzeugfesten Teilen wie z. B. die Lüfterzarge oder der Lüfterzargenring werden daher durch elastische, flexible Ausgleichselemente kompensiert.Axial fan for conveying cooling air for cooling devices, in particular cooling modules in motor vehicles, are known, for. B. as an axial fan with free-standing blade tips, which rotate in a stationary Zargenring a fan cowl. Also known are so-called jacket fans, in which a jacket is connected to the blade tips of the fan blades and rotates with the fan. Due to the circumferential jacket, blade tip losses, which arise from a flow around the blade tips as a result of the pressure differences on the pressure and suction sides of the fan blades, are avoided. For larger vehicles, especially commercial vehicles, the fan is driven by the internal combustion engine of the motor vehicle and is mounted relative to the block of the internal combustion engine. The cooling device, however, consisting of heat exchangers, z. As coolant or intercoolers, is supported on the vehicle side, while the engine is mounted elastically relative to the vehicle frame. This results in relative movements between the fan and the cooling device or attached to the cooling fan shroud. The relative movement between the engine-fixed parts such. B. the fan and the vehicle-fixed parts such. As the fan cowl or fan shell ring are therefore compensated by elastic, flexible compensation elements.
Durch die
Durch die
Bei heutigen Kraftfahrzeugen steht für den Einbau von Kühlvorrichtungen einschließlich Lüfter wenig Bauraum zur Verfügung, andererseits steigen die Anforderungen in Bezug auf die zu erbringende Kühlleistung und damit auch auf die Lüfterleistung.In today's motor vehicles is for the installation of cooling devices including fans little space available, on the other hand, the requirements increase in terms of the cooling performance to be provided and thus on the fan performance.
Ein ähnlicher Axiallüfter wird in
Es ist Aufgabe der Erfindung, einen Axiallüfter der eingangs genanten Art hinsichtlich seiner Förderleistung bei einem beschränkten Bauraum zu verbessern.It is an object of the invention to improve an axial fan of the type mentioned in terms of its capacity in a limited space.
Diese Aufgabe wird durch die Merkmale der Patentansprüche 1 gelöst.This object is solved by the features of claims 1.
Erfindungsgemäß ist die Anströmkante des Mantels gegenüber den Vorderkanten der Lüfterschaufeln (im Folgenden auch Lüfterblätter genannt) in Strömungsrichtung zurückgesetzt, d. h. der Mantelring erstreckt sich in axialer Richtung nur über einen Teil der Lüfterblatttiefe, und zwar über den stromabwärts gelegenen Teil. Vorzugsweise ist in diesem Bereich der Zurücksetzung des Mantels ein feststehender Leitring angeordnet, welcher vorzugsweise einen gegenüber dem Mantelring reduzierten Durchmesser aufweist. Der feststehende Zargenring ist somit in Strömungsrichtung vor dem Mantelring und radial innerhalb des Mantelringes angeordnet. Damit wird der Vorteil einer Strömungsstabilisierung im Blattspitzenbereich erreicht, verbunden mit einem erhöhten Wirkungsgrad und geringerer Geräuschentwicklung.According to the invention, the leading edge of the jacket is set back in the direction of flow with respect to the leading edges of the fan blades (also referred to below as fan blades), ie. H. the shroud extends in the axial direction only over a part of the fan blade depth, via the downstream part. Preferably, a fixed guide ring is arranged in this region of the reset of the shell, which preferably has a reduced diameter relative to the shroud. The fixed Zargenring is thus arranged in the flow direction in front of the shroud and radially within the shroud. Thus, the advantage of a flow stabilization in the blade tip area is achieved, combined with increased efficiency and lower noise.
Nach bevorzugten Ausführungsformen der Erfindung kann der Zargenring im Wesentlichen zylindrisch oder konisch mit einer Erweiterung in Strömungsrichtung ausgebildet oder auch mit einem glocken- oder trichterförmigen Einlaufbereich versehen sein, der vorzugsweise gegenüber den Lüfteranströmkanten entgegen der Strömungsrichtung versetzt angeordnet ist.According to preferred embodiments of the invention, the Zargenring may be formed substantially cylindrical or conical with an extension in the flow direction or be provided with a bell-shaped or funnel-shaped inlet region, which is preferably arranged opposite to the Lüfteranströmkanten offset from the flow direction.
Nach einer weiteren bevorzugten Ausführungsform ist an dem Zargenring im Bereich der Anströmkante des Mantelringes ein Umlenkelement angeordnet, welches eine entgegen der Hauptströmung durch den Axiallüfter gerichtete Spaltströmung erzeugt. Bevorzugt ist das ringförmige Umlenkelement durch eine sich in Strömungsrichtung der Hauptströmung erstreckende Ringfläche verlängert, welche mit der äußeren Mantelfläche des Mantelringes einen Ringspalt bildet. Damit wird die Ausbildung einer wirksamen Spaltströmung unterstützt, welche die Hauptströmung im Blattspitzenbereich, d. h. innerhalb des Mantels stabilisiert. Darüber hinaus wird bei einem sich in stromabwärtiger Richtung erweiternden Mantelring und einer sich parallel erweiternden Ringfläche eine radiale Abströmung der Austrittsströmung begünstigt. Dies ist bei axial beschränktem Bauraum - infolge eines stromabwärts vom Lüfter angeordneten Motorblockes des Kraftfahrzeuges - von besonderem Vorteil.According to a further preferred embodiment, a deflecting element is arranged on the Zargenring in the region of the leading edge of the shroud, which generates a directed against the main flow through the axial fan gap flow. Preferably, the annular deflecting element is extended by an annular surface extending in the direction of flow of the main flow which forms an annular gap with the outer lateral surface of the lateral ring. Thus, the formation of an effective gap flow is supported, which stabilizes the main flow in the blade tip area, ie within the shell. In addition, a radially outflow of the outlet flow is favored in a sheath ring which widens in the downstream direction and a ring surface which widens in parallel. This is in an axially limited space - due to a downstream of the fan arranged engine block of the motor vehicle - of particular advantage.
Zur weiteren Unterstützung einer radialen Abströmung können an der Ringfläche Strömungsleitelemente, vorzugsweise in Form eines radialen Nachleitapparates vorgesehen sein. Die Erfindung mit den vorgenannten Ausführungsformen sieht infolge der Zurücksetzung des Mantels gegenüber den Schaufelvorderkanten also nur eine partielle Ummantelung der Lüfterschaufeln in Bezug auf die Schaufeltiefe vor, wobei in dem nicht ummantelten Bereich, dem Bereich der Zurücksetzung, der feststehende Zargenring angeordnet ist. Dadurch werden einerseits axialer Bauraum - im Hinblick auf einen Mantellüfter mit Einlaufdüse gemäß dem Stand der Technik und andererseits eine Stabilisierung der Hauptströmung als wesentliche Vorteile erreicht.To further support a radial outflow can be provided on the annular surface Strömungsleitelemente, preferably in the form of a radial Nachleitapparates. The invention with the aforementioned embodiments thus provides only a partial sheathing of the fan blades with respect to the blade depth due to the resetting of the shell relative to the blade leading edges, wherein in the non-jacketed region, the region of the reset, the fixed Zargenring is arranged. As a result, on the one hand axial space - achieved in terms of a shell fan with inlet nozzle according to the prior art and on the other hand, a stabilization of the main flow as significant advantages.
Die Aufgabe der Erfindung wird auch durch einen Axiallüfter mit den Merkmalen des nebengeordneten Patentanspruches 13 gelöst. Der erfindungsgemäße Axiallüfter weist einen vorstehenden, in eine Einlaufdüse hineinragenden Mantelring auf, wodurch die aus dem Stand der Technik bekannte Spaltströmung mit einer 180-Grad-Umlenkung zur Strömungsstabilisierung erreicht wird. Zur Vermeidung einer Fehlanströmung weist der erfindungsgemäße Axiallüfter eine freistehende Vorder- und Blattspitzenkante auf, d. h. zwischen dem anströmseitigen Blattspitzenbereich und der Innenfläche des Mantelrings ist ein Spalt in Form eines Zwickels belassen. Die Lüfterschaufeln können somit im vorderen und äußersten Bereich besser angeströmt werden, d. h. mit geringeren Verlusten, welche sich aus einer Fehlanströmung durch die Spalt- oder Düsenströmung ergeben. Die Fehlanströmung ist verursacht durch eine gegenüber der Hauptströmung höhere Geschwindigkeit der Spalt- oder Düsenströmung, die darüber hinaus eine Umfangskomponente aufweist. Somit wird ein beim Stand der Technik vorhandener Nachteil durch eine freie, vordere Blattspitzenkante beseitigt. Dennoch wird die stabilisierende Wirkung der Düsenströmung aufrechterhalten.The object of the invention is also achieved by an axial fan with the features of the
Ausführungsbeispiele der Erfindung sind in der Zeichnung dargestellt und werden im Folgenden näher erläutert. Es zeigen
- Fig. 1
- ein erstes Ausführungsbeispiel der Erfindung für einen Axiallüfter mit zurückgesetztem Mantelring und feststehendem Zargenring,
- Fig. 2
- eine Abwandlung des Ausführungsbeispieles gemäß
Fig. 1 , - Fig. 3
- ein weiteres Ausführungsbeispiel der Erfindung mit einem Mantellüfter und Einlaufdüse,
- Fig. 4
- eine Abwandlung des Ausführungsbeispieles gemäß
Fig. 1 , - Fig. 5
- eine weitere Abwandlung des Ausführungsbeispieles gemäß
Fig. 1 , - Fig. 6
- ein weiteres Ausführungsbeispiel der Erfindung mit einem am Leitring angeordneten ringförmigen Umlenkelement,
- Fig. 7
- eine Weiterbildung des Ausführungsbeispieles gemäß
Fig. 6 , - Fig. 8
- eine Weiterbildung des Ausführungsbeispieles gemäß
Fig. 7 , - Fig. 9
- eine Darstellung der Lüfterströmung für einen Axiallüfter nach dem Stand der Technik,
- Fig. 10
- eine Darstellung der Haupt- und Spaltströmung bei einem Mantellüfter mit Einlaufdüse nach dem Stand der Technik und
- Fig. 11
- eine Darstellung der Haupt- und Spaltströmung bei einem erfindungsgemäßem Axiallüfter.
- Fig. 1
- A first embodiment of the invention for an axial fan with reset shroud and fixed frame ring,
- Fig. 2
- a modification of the embodiment according to
Fig. 1 . - Fig. 3
- a further embodiment of the invention with a jacket fan and inlet nozzle,
- Fig. 4
- a modification of the embodiment according to
Fig. 1 . - Fig. 5
- a further modification of the embodiment according to
Fig. 1 . - Fig. 6
- a further embodiment of the invention with an annular deflecting element arranged on the guide ring,
- Fig. 7
- a development of the embodiment according to
Fig. 6 . - Fig. 8
- a development of the embodiment according to
Fig. 7 . - Fig. 9
- a representation of the fan flow for an axial fan according to the prior art,
- Fig. 10
- a representation of the main and gap flow in a shell fan with inlet nozzle according to the prior art and
- Fig. 11
- a representation of the main and gap flow in an inventive axial fan.
Die Ausführungsbeispiele gemäß
Claims (14)
- An axial fan for conveying cooling air for a cooling device of a motor vehicle, wherein the axial fan is adapted to be connected to an upstream heat exchanger via a fan shroud for conveying the cooling air, wherein the axial fan comprises axial vanes (4), each having a leading edge (4a) and a trailing edge (4b) as well as a vane tip (4c), and a shroud ring (5) connected to the vane tips (4c) and having an inflow edge (5a) and an outflow edge (5b), characterised in that the inflow edge (5a) of the shroud ring (5) is recessed relative to the leading edges (4a) of the axial vanes (4) in the flow direction (L) such that the shroud ring only extends over the downstream portion of the fan vane depth in axial direction, and a stationary guide ring (6, 8, 14, 15, 17, 21) is arranged upstream of the shroud ring (5) relative to the flow direction in the recessed section (X1).
- The axial fan according to claim 1, characterised in that the diameter D1 of the vane tips (4c) is reduced in comparison to the diameter of the shroud ring (5) in the recessed section (X1).
- The axial fan according to claim 2, characterised in that the diameter D2 of the guide ring (6, 8, 14, 15, 17, 21) is smaller than the diameter of the shroud ring (5), particularly smaller than the diameter of the inflow edge (5a) of the shroud ring (5).
- The axial fan according to any one of claims 1 to 3, characterised in that the guide ring (6) is of essentially cylindrical shape.
- The axial fan according to any one of claims 1 to 3, characterised in that the guide ring (8, 17, 21) is of essentially conical shape and widens in the flow direction.
- The axial fan according to any one of the preceding claims, characterised in that the guide ring (14) widens conically or in the form of a bell in the air inlet section.
- The axial fan according to any one of the preceding claims, characterised in that the guide ring (6, 8, 14, 15, 17, 21) has an inflow edge which is arranged upstream of the leading edges (4a) of the axial vanes (4) relative to the flow direction.
- The axial fan according to claim 7, characterised in that an annular deflecting element, particularly in the form of a cover ring (15a), is arranged on the inflow edge of the guide ring (15).
- The axial fan according to any one of the preceding claims, characterised in that the outflow edge (5b) of the shroud ring (5) is offset to the front from the trailing edges (4b) of the axial vanes (4) in the flow direction.
- The axial fan according to any one of the preceding claims, characterised in that an annular diverting element (19) is arranged on the guide ring (17, 21), wherein the outside diameter of the annular diverting element is larger than the diameter of the inflow edge (5a) of the shroud ring (5).
- The axial fan according to claim 10, characterised in that the diverting element (19) is extended by an annular surface (22) that is essentially parallel to the outer surface of the shroud ring (5), leaving a radial gap (23).
- The axial fan according to claim 11, characterised in that flow guide elements (24), particularly in the form of a radial discharge nozzle, are arranged on the downstream end of the annular surface (22).
- An axial fan for conveying cooling air for a cooling device of a motor vehicle, wherein the axial fan (9) comprises axial vanes (4), each having a leading edge (4a) and a trailing edge (4b) as well as a vane tip (4c), and a shroud ring (10) connected to the vane tips (4c) and having a cylindrical section (10a) which extends beyond the leading edges (4a) of the axial vanes (4) and projects into an inlet nozzle (11), characterised in that a gap (s) remains between the shroud ring (10) and the leading edges (4a) of the axial vanes (4).
- The axial fan according to claim 13, characterised in that the gap (s) has the shape of an acute angle in an axial section, wherein one leg is formed by a surface line of the shroud (10) and the other leg is formed by a free edge (12) of the leading vane tip (4c).
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102006047236.5A DE102006047236B4 (en) | 2006-10-04 | 2006-10-04 | Axial fan arranged to promote cooling air of a cooling device of a motor vehicle |
PCT/EP2007/008055 WO2008040443A1 (en) | 2006-10-04 | 2007-09-17 | Axial fan for conveying cooling air for a cooling device of a motor vehicle |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2076661A1 EP2076661A1 (en) | 2009-07-08 |
EP2076661B1 true EP2076661B1 (en) | 2016-11-09 |
Family
ID=38983488
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP07818176.5A Not-in-force EP2076661B1 (en) | 2006-10-04 | 2007-09-17 | Axial fan for conveying cooling air for a cooling device of a motor vehicle |
Country Status (4)
Country | Link |
---|---|
US (1) | US8277180B2 (en) |
EP (1) | EP2076661B1 (en) |
DE (1) | DE102006047236B4 (en) |
WO (1) | WO2008040443A1 (en) |
Families Citing this family (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102006049076B4 (en) | 2006-10-13 | 2019-09-26 | Mahle International Gmbh | Axial fan arranged to promote cooling air for a cooling device of a motor vehicle |
DE102009012025A1 (en) | 2009-03-10 | 2010-09-16 | Behr Gmbh & Co. Kg | Cooling device for a motor vehicle |
DE202010010913U1 (en) * | 2010-07-31 | 2011-11-03 | Brose Fahrzeugteile GmbH & Co. Kommanditgesellschaft, Würzburg | Shroud |
KR101724294B1 (en) * | 2010-10-27 | 2017-04-07 | 엘지전자 주식회사 | Out door unit of air conditioner |
US9404511B2 (en) | 2013-03-13 | 2016-08-02 | Robert Bosch Gmbh | Free-tipped axial fan assembly with a thicker blade tip |
US9765788B2 (en) * | 2013-12-04 | 2017-09-19 | Apple Inc. | Shrouded fan impeller with reduced cover overlap |
DE102013227025A1 (en) | 2013-12-20 | 2015-06-25 | MAHLE Behr GmbH & Co. KG | Axial |
DE102014103839A1 (en) * | 2014-03-20 | 2015-09-24 | Wistro Elekto-Mechanik Gmbh | Fan |
NL2014380B1 (en) | 2015-03-02 | 2017-01-17 | Eco-Logical Entpr B V | Enthalpy exchanger. |
USD860427S1 (en) | 2017-09-18 | 2019-09-17 | Horton, Inc. | Ring fan |
DE112020004585T5 (en) * | 2019-09-27 | 2022-06-23 | Denso Corporation | fan |
Family Cites Families (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4329946A (en) * | 1979-10-09 | 1982-05-18 | General Motors Corporation | Shroud arrangement for engine cooling fan |
DE3304297A1 (en) * | 1982-03-15 | 1984-03-15 | Süddeutsche Kühlerfabrik Julius Fr. Behr GmbH & Co KG, 7000 Stuttgart | Axial fan, especially for a cooler of a water-cooled internal combustion engine |
IT8353039V0 (en) | 1982-03-15 | 1983-03-10 | Sueddeutsche Kuehler Behr | AXIAL FAN PARTICULARLY FOR WATER COOLED THERMAL ENGINE COOLING RADIATORS |
GB8334120D0 (en) * | 1983-12-21 | 1984-02-01 | Gerry U K | Diffusers |
DE9016496U1 (en) * | 1990-12-05 | 1991-03-14 | Behr GmbH & Co, 7000 Stuttgart | Axial fan |
DE9017417U1 (en) * | 1990-12-22 | 1991-03-14 | Behr GmbH & Co, 7000 Stuttgart | Fan unit for a cooler |
IT1269656B (en) * | 1994-09-21 | 1997-04-08 | Lombardini Fab It Motori Spa | AIR CONVEYING SYSTEM FOR C.I. ENGINE RADIATORS |
DE4438184C1 (en) * | 1994-10-26 | 1996-04-11 | Behr Gmbh & Co | Axial air fan for heavy goods vehicle radiator |
KR100467331B1 (en) * | 1997-06-05 | 2005-04-08 | 한라공조주식회사 | Fan and fan-shroud assembly |
US5957661A (en) | 1998-06-16 | 1999-09-28 | Siemens Canada Limited | High efficiency to diameter ratio and low weight axial flow fan |
DE10135698A1 (en) * | 2001-07-21 | 2003-02-06 | Alu Kunststoff Technik Fuer Au | Fan assembly for radiator of internal combustion engine has impeller protruding in axial direction at least partially from air guiding element, with length of protruding section being preferably 30-50 per cent of impeller width |
US6599088B2 (en) * | 2001-09-27 | 2003-07-29 | Borgwarner, Inc. | Dynamically sealing ring fan shroud assembly |
JP4085948B2 (en) | 2003-10-01 | 2008-05-14 | 株式会社デンソー | Cooling fan and blower |
DE102006037628A1 (en) * | 2006-08-10 | 2008-02-14 | Behr Gmbh & Co. Kg | Cooling device for a motor vehicle |
-
2006
- 2006-10-04 DE DE102006047236.5A patent/DE102006047236B4/en not_active Expired - Fee Related
-
2007
- 2007-09-17 US US12/441,755 patent/US8277180B2/en active Active
- 2007-09-17 EP EP07818176.5A patent/EP2076661B1/en not_active Not-in-force
- 2007-09-17 WO PCT/EP2007/008055 patent/WO2008040443A1/en active Application Filing
Also Published As
Publication number | Publication date |
---|---|
US8277180B2 (en) | 2012-10-02 |
DE102006047236B4 (en) | 2017-06-29 |
DE102006047236A1 (en) | 2008-04-10 |
EP2076661A1 (en) | 2009-07-08 |
US20100014967A1 (en) | 2010-01-21 |
WO2008040443A1 (en) | 2008-04-10 |
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